Fuel injection pump



Oct. 18, 1938,

G. A. GlLLEN 2,133,813

FUEL INJECTION PUMP Filed Oct. 25, 1936 GEORGE A. GILLEN INVENTOR BY AT RNEY Patented Oct'. 18, 1938 2,133,813 FUEL INJECTION rum George A. Gillen, New York, N. Y. Application October 23, 1 936, Serial No. 102,169 2 Claims- (ci. 103-41) This invention relates to internal combustion engines of the fuel injection type.

Special objects of the invention are to effect an accurate metering of the fuel to correspond 5 with varying load requirements and-to'accomplish this with sturdy, simple and practical apparatus.

These and other desirable objects are attained 'by novel features of construction, combinations l and relations of parts hereinafter disclosed and cylinder engine and specialrelief valves which,

25 can" be opened sooner or later in the cycle to bypass greater or less. portions of the fuel to suitload requirements on the engine.

' The injectors are designated} and as shown particularly at the left in Figure 1, they consist in each instance of a hollow piston l sliding over a fixed cylinder having an intake port 6 connected through a check valve I with a supply manifold 8. The latter is indicated as connected by a pipe 9 with a liquid fuel tank I.

The hollow piston is suitably sealed over the fixed cylinder, as by means of packing rings indicated at II, and motion is imparted to the piston, in one direction by the spring I2 surrounding and acting-against a flange [3 at the outer end of the piston and in the opposite, injecting direction by a face cam l4 bearing on the head or closed end of the piston.

The injector cam I4 is shown as forming part of the head or enlargement IS .on the upper end 45 of a sleeve I6 journalled in a casing l1 and suitably supported, as by means of radial and thrust bearings l8, l9. This cam sleeve is shown as rotated by an engine driven shaft 20 carrying a bevel pinion 2| in mesh with a corresponding ring gear 22 fixed to the lower end of the sleeve. The several injectors are shown as located in a cavity, or chamber enlargement 23 in them:- per end of the casing or hollow basestructure l1 and the piston elements of the several pumps UNITED STATES PATENT "OFFICE" are shown as carried by a detachable head structure 24 closing the upper end of this chamber.

With rotation of the cam sleeve Hi, the hollow pump pistons will be reciprocated and in so doing, they will, in the lowering or intake stroke, 5 take in liquid fuel through the intake passages 6 and, on the reverse, upward stroke, will force liquid out through the discharge ports 25 and through the feed lines 26 to the atomizer ozzles or fuel injecting devices in-the engine 'cy ders.

To predetermine the amount of liquid which each injector will pump to the cylinder with which it is connected, each pump cylinder has a relief passage 21 leading to a valve. body 28, containing a valve 29 urged in a closing direction by spring 30, but adapted to be opened by an oppositely acting rocker 3| carrying a roll 32 for engagement with a cam 33.

The reliei cam 33 is shown as carried by the upper end of a sleeve 34 slidingly keyed at 35 in the pump cam sleeve It so as to rotate with the latter and the inner cam sleeve is shown as longitudinally adjustable by having a hub flange 36 engaged by the yoke 31 at one end of a lever 38 pivoted at 39 and carrying at its opposite'end,

a nut element 40 engaged by the adjusting screw shaft ll. I

The adjusting shaft ll may be equipped with a suitable handle for turning the same or the ad justment of this shaft may be effected automatically as required. for desired engine'performance. It will be clear that with longitudinal adjustment of sleeve 34, the relief cam 33 may be raised or lowered and hence be caused to open the relief valves sooner or later in the cycle of operations.

The parts may be so designedthat the reliefcam may be' withdrawn so far as not to actuate the relief valves at all and in which event the injectors will pump substantially their-full displacement. The range of adjustment may be such that the relief camgmay be advanced to such an extent as to open the relief valves at the commencement of the pumping stroke to thereby prevent any pumpingaction. Adjustments between these extremes will regulate the amount of liquid pumped by each injector and such regulation may be made instantly and at anytime. 1

The several relief valves may be connected to discharge intoa common relief manifold 42 and the latter may be connected to discharge through a return line 43 into the fuel tank II.

The adjustment of the cam varies the point 01' engagement between the cam and rockers and this,wlth proper angle and contour of cam, may

be utilized'to eflect any desired "lead-or "188" in the relief valve operation, as might be desirable for different engine speeds and loads.

While the construction illustrated may be considered as a preferred form at the present time, it will be appreciated that construction may be altered to suit different conditions and require ments. The terms employed herein have, therefore, been used in a descriptive rather than in a limiting sense, except possibly as limitations may be imposed by the state of the prior art.

I claim:

1. In combination, a casing having a generally cylindrical seat, a sleeve journalled to rotate in said seat and having a cam at one end, a cover applied to the end of the casing over said cam end of the sleeve, fuel injector pumps in concentric relation on said cover and operatively opposed to .said cam on the end of said rotatingsleeve, a circular series of relief valves for said injector pumps and concentrically related to said pumps, a cam element slidingly keyed in said rotating sleeve in position to actuate said relief valves and means for adjusting said sliding cam element longitudinally in said rotating cam sleeve.

2. In combination, rotating concentric cam sleeves slidingly keyed together and shiftable one in respect to the other, cam elements on the adjoining ends of said sleeves, fuel injector pumps supported in position to be actuated by the cam element on the end of one of said sleeves, relief valves for said injector pumps supported for actuation by the cam element on the end of the other of said sleeves, means for effecting rotation of said sleeves and means for effecting relative longitudinal shifting of one sleeve in respect to the other.

GEORGE A. GIILEN. 

